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I think Dave and Peter are probably right. LED lamps suitable for motor vehicles have electronics boards to regulate the supply to the actual LED array. These will have different thresholds, even between lamps from the same source, below which they will not work. Your pump is a big current draw so when your battery isn't being charged and say has got down to 12.3 - 12.5V you can expect it to dip quite severely when the pump runs.

If it happens when on charge or with a fully charged battery then I would be looking for a poor connection (earth or positive feed) in the circuitry that the LEDs and the pumps share. That could just be from the battery to 'fuse unit'.

Get back to us when you know more :)
 
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